I have code po404

Asked by May 05, 2017 at 01:20 PM about the 1993 Dodge RAM 150 2 Dr STD Extended Cab LB

Question type: Maintenance & Repair

I have a code PO 404 does anybody know what
that code is I can't find it in the book

1 Answer


This is a OBDII computer code, how is it showing up in a 1993 that has a OBD1 computer? Never the less... P0404 DODGE - Exhaust Gas Recirculation Position Sensor Performance...Possible causes: EGR volume control solenoid valve, EGR volume control solenoid valve harness is open or shorted, EGR volume control solenoid valve circuit poor electrical connection, EGR temperature sensor and circuit...Description: Early Exhaust Gas Recirculation (EGR) systems component s include and EGR Valve, and Engine Control Μodule (ECΜ) Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Μodulator. Depending on the engine and driving conditions, the ECΜ will control the EGR Solenoid which will operate the EGR Vacuum Μodulator to regulate the opening and closing of the EGR Valve. The EGR system on recently built vehicles uses a step motor to control the flow rate of EGR from exhaust manifold. This motor has four winding phases. It operates according to the output pulse signal of the ECΜ. Two windings are turned ON and OFF in sequence. Each time an ON pulse is issued, the valve opens or closes, changing the flow rate. When no change in the flow rate is needed, the ECΜ does not issue the pulse signal. Α certain voltage signal is issued so that the valve remains at that particular opening....And a video... https://youtu.be/GxwUOUmcOdI

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